单项选择题

Lower taxes would spur investment and help economic growth.

A．spend
B．require
C．encourage
D．attract
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The project required ten years of diligent research.
A．hardworking
B．basic
C．social
D．scientific
单项选择题
Her father was a quiet man with graceful manners.
A．polite
B．similar
C．usual
D．bad
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